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Report: Cory Monteith cause of death heroin and alcohol

(TMZ) - TMZ reports Cory Monteith died from a lethal combination of heroin and alcohol ... this according to Canadian authorities.

TMZ as learned that the British Columbia Coroners Service says an autopsy and toxicological analysis show that the 31-year-old "Glee" star died on from a "mixed drug toxicity, involving heroin and alcohol."

Monteith's body was discovered by staffers at the Fairmont Pacific Rim hotel in Vancouver, Canada on July 13.

Monteith had struggled with addiction for years and had been to rehab earlier this year.

Monteith had said he began struggling with drugs and alcohol as a young teenager.